Defines a cubic spline basis matrix.
FORTRAN (libfgl.a)
void defbasis(Int32 id, Matrix mat)
SUBROUTINE DEFBAS(id, mat) INTEGER*4 id REAL mat(4,4)
The defbasis subroutine assigns a basis matrix identifier for use by subroutines that generate curves and patches. Use the basis matrix identifier in subsequent calls to the curvebasis and patchbasis subroutines.
Note: This subroutine cannot be used to add to a display list.
| id | Specifies the basis identifier to assign to the matrix. |
| mat | Specifies the matrix to which to assign the basis identifier. |
The example C language program curve1.c uses the defbasis subroutine to define three basis matrices for drawing curves.
This subroutine is part of GL in the AIXwindows Environment/6000 Version 1, Release 2 with AIXwindows/3D Feature.
| /usr/include/gl/gl.h | Contains C language constant and variable type definitions for GL. |
| /usr/include/gl/fgl.h | Contains FORTRAN constant and variable type definitions for GL. |
Drawing a cubic spline curve with the crv subroutine.
Drawing a series of curve segments with the crvn subroutine.
Setting the current cubic spline curve basis matrix with the curvebasis subroutine.
Setting the number of line segments that draw a curve segment with the curveprecision subroutine.
Drawing surface patches with the patch subroutine.
Setting the current spline surface basis matrices with the patchbasis subroutine.
Setting the number of curves used to represent a patch with the patchcurves subroutine.
Setting the precision at which curves are drawn with the patchprecision subroutine.
Drawing a rational curve with the rcrv subroutine.
Drawing a series of rational curve segments with the rcrvn subroutine.
AIX Graphics Library Overview, Drawing NURBS Curves and Surfaces, and Drawing Wire Frame Curves and Surface Patches.